The hypothesis of vector meson dominance (VMD) [1]} assumes
a definite relation between
the amplitude of the photon (real or virtual)-hadron interaction,
\({\cal A}(\gamma _{{\rm tr}}^{\ast }+T \rightarrow \dots )\) ,
and a linear
combination of the amplitudes of the corresponding strong production by
transversely polarized vector mesons, \({\cal A}(V_{{\rm tr}}+T \rightarrow \dots )\) ,
\({\cal A}(\gamma _{{\rm tr}}^{\ast }+T \rightarrow \dots )=\sum _{V=\rho , \omega ,\phi } \frac{e}{f_V} \frac{m_V^2}{m_V^2+Q^2} {\cal A}(V_{{\rm tr}}+T \rightarrow \dots ) \,,\) 
